Use https://github.com/ww-rm/SpineViewer if you want to view the animations (Note that you must have the .atlas, .json and .png in the same folder for this to work and edit the .atlas to support the .png in it).

Also side note for Finnick when loaded in, only part of his fur will be seen and that's simply because in Skin, only the default button is on while hero/hero-flip is off, which will only show his fur and not the full model.